Region-Based Decentralized Time Slot Allocation Strategy for Asymmetric Traffic in TDD Systems

Time division duplex (TDD) systems and their crossed-slot interference problem in cellular environment have been attracting increasing interest. To mitigate the crossed-slot interference, we propose the REgion-based Decentralized Time Slot Allocation (RED-TSA) strategy, and evaluate its call blocking probability, uplink SINR, and overall uplink throughput compared with those of previous TSA strategies. A statistical traffic model is adopted to simulations for a realistic modeling of dynamic call traffic. A major advantage of the proposed RED-TSA strategy is that it can be implemented autonomously in each cell without any coordination between cells. Furthermore, simulation results show that the improvement of uplink throughput in the RED-TSA strategy increases as the portion of data calls increases.